完整代码：
1 <!DOCTYPE html>
2 <html>
3 <head>
4 </head>
5
6 <body>
7 <div style="font-size:16px;float:left ;">
8 <label class="text">内容
9 <input type="text" id="key" name="key"
10 placeholder="请输入"></label>
11 <button type="button" onclick="clearText()">清空</button>
12 </div>
13 </body>
14
15 {#地址根据实际的路径填写#}
16 <script type="text/javascript" src="xxxxx/js/jquery.min.js"></script>
17 <script type="text/javascript" language="javascript">
18 function clearText() {
19 $('.text input').val('');
20 }
21 </script>
22
23 </html>
